[SI-LIST] Re: Floating Cable Shield
- From: Ivor Bowden <ivorlist@xxxxxxxxxxx>
- To: Shawn Nikoukary <shawnn@xxxxxxxxxxx>
- Date: Wed, 11 Oct 2006 10:06:56 -0700
Hi Shawn,
I don't have a camera here, but the cable had ID on it, so I looked it
up on the web. If you go to:
http://www.vantecusa.com/product-accessory.html#
and click on
Rounded Cable -> IDE
you can see an image. The cable I have is the clear one with the silver
braid. The images aren't that big, but you can get an idea.
It doesn't make any sense to me, that's why I posted. If there is to be
a shield on the cable, it should be well grounded at both ends, imo.
Ivor
on 10/11/2006 8:38 AM PDT Shawn Nikoukary wrote:
> Hello Ivor,
>
> Is it possible for you to send us a pic or the link of manufacturer for
> this cable? I am curious to see how it looks.
>
> Regards,
>
> Shawn Nikoukary Cadence Design Systems
> Sales Technical Lead 2655 Seely Ave, MS 9B2
> Silicon Package Board Division San Jose, CA 95134
> Office (408) 944-7328 Cell (408) 712-1073
> Email: shawnn@xxxxxxxxxxx Fax (408) 944-7772
>
> -----Original Message-----
> From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
> On Behalf Of Ivor Bowden
> Sent: Wednesday, October 11, 2006 8:29 AM
> To: si-list@xxxxxxxxxxxxx
> Subject: [SI-LIST] Floating Cable Shield
>
> Hi,
>
> I ran into what I thought was an interesting cable and am looking for
> comments. This is an IDE cable on a new PC I got. The construction is
> twisted pair ribbon cable (flat spots for IDCs between the twisted
> sections), about 20" long, IDC both ends, a 3rd IDC about 7" from one
> end. What makes the cable interesting to me is there are two braided
> shields covering the bundled twisted pair sections, one about 8", the
> other about 3.5". These shields have no connections, not to a drain
> wire, not to each other and to to any circuit or frame ground, they are
> entirely floating. My question is, how effective is this type of
> "floating" shield, in terms of SI and EMI?
>
> This also brings up the general question of cable shield termination,
> circuit/chassis ground at both ends v.s. one end only v.s. floating;
> what characteristics to expect in each case?
>
> And that brings up the specific question of shield return treatment in
> the connector area, single drain wire v.s. complete enclosure?
>
> Thanks,
>
> Ivor Bowden
> Hardware Engineer
> Curtiss-Wright Controls Embedded Computing
> Video and Graphics
> San Diego, CA 92121
>
>
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